The Centers for Disease Control and Prevention’s COVID-19 Vaccine Advisory Committee will attend an emergency meeting next week to discuss reports of higher-than-expected heart inflammation in young men receiving second doses of Pfizer and Moderna vaccines.

The June 18 meeting will address conditions that are very rare and not directly linked to vaccines.

The CDC’s Dr. Tom Shimabukuro said Thursday that as of May 31, the agency has received 275 preliminary reports of inflammation of the heart — known as myocarditis and pericarditis — in 16- to 24-year-olds.

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More than 12 million people in that age group have been fully vaccinated.

“It’s a bit of an apples-to-oranges comparison because, again, these are preliminary reports. Not all of them will turn out to be true myocarditis or pericarditis reports,” Shimabukuro said, for CBS News.

Shimabukuro said the condition is more prevalent among young men. He said that most of the people who have reported the condition have fully recovered.